Colorado’s new Corrections Department director is promising to reform solitary confinement policies after spending the night in an isolated cell, an experiment he said left him “feeling twitchy and paranoid.”

Colorado prisons would have the power to revoke inmates’ earned time for any reason, or if they have committed a violent crime while incarcerated, with a bill given initial approval Thursday in the House.

Colorado prison officials are being directed to stop placing mentally ill inmates in solitary confinement as the corrections department continues to decrease the number of people on administrative segregation.